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7. If p, is the relative permeability of a given medium, u is a permeability and po is the permeability of the free space, then the expression for u, is given by a) u, = Ha/u b) H, = H/Ho c) Hi = Ho/ !! e) None of the above 8. The air gap between poles has a) No magnetic field b) No magnetic unless the poles are far apart c) A strong magnetic field d) A magnetic field if the poles tough 9. Which of the following statement is true? a) Iron, steel, and nickel are magnetic materials. b) Copper, iron, steel, and air are magnetic materials. e) Paper, wood, and steel are magnetic materials. d) Iron is magnetic materials but steel is non-magnetic. 10. A ferrite core has less eddy-current loss than an iron a core because

7. If p, is the relative permeability of a given medium, u is a permeability and po is the permeability of the free space, then the expression for u, is given by a) u, = Ha/u b) H, = H/Ho c) Hi = Ho/ !! e) None of the above 8. The air gap between poles has a) No magnetic field b) No magnetic unless the poles are far apart c) A strong magnetic field d) A magnetic field if the poles tough 9. Which of the following statement is true? a) Iron, steel, and nickel are magnetic materials. b) Copper, iron, steel, and air are magnetic materials. e) Paper, wood, and steel are magnetic materials. d) Iron is magnetic materials but steel is non-magnetic. 10. A ferrite core has less eddy-current loss than an iron a core because

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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7. If µr is the relative permeability of a given medium, u is a permeability and Ho is the permeability of the free space, then the expression for Hr is given by 1/eM = (e b) µ, = H/Ho c) H, = Ho/u* 1/eri = 'n (p e) None of the above 8. The air gap between poles has a) No magnetic field b) No magnetic unless the poles are far apart c) A strong magnetic field d) A magnetic field if the poles tough 9. Which of the following statement is true? a) Iron, steel, and nickel are magnetic materials. b) Copper, iron, steel, and air are magnetic materials. e) Paper, wood, and steel are magnetic materials. d) Iron is magnetic materials but steel is non-magnetic. 10. A ferrite core has less eddy-current loss than an iron a core because a) Ferrites have low resistance b) Ferrites have high resistance c) Ferrites have low permeability d) Ferrites have high hysteresis 11. Which of the following rules states that the direction of an induced current is always such that the magnetic field which it produces reacts in opposition to the change of flux. a) Thumb rule b) Lenz's law c) Kirchhoff's law d) Faraday's law 12. What conditions are necessary for an induced voltage to be created by means of rotation. a) A magnetic field b) Movably placed loops conductors (turns) c) Lump conductors d) (a) and (b) both 13. The operation of the electric generator and motor is based on the interaction between a) Magnetic field and electric field b) Magnetic field and electric current C) Electric field and law of induction d) Law of induction and dynamo-electric principle
Transcribed Image Text:7. If µr is the relative permeability of a given medium, u is a permeability and Ho is the permeability of the free space, then the expression for Hr is given by 1/eM = (e b) µ, = H/Ho c) H, = Ho/u* 1/eri = 'n (p e) None of the above 8. The air gap between poles has a) No magnetic field b) No magnetic unless the poles are far apart c) A strong magnetic field d) A magnetic field if the poles tough 9. Which of the following statement is true? a) Iron, steel, and nickel are magnetic materials. b) Copper, iron, steel, and air are magnetic materials. e) Paper, wood, and steel are magnetic materials. d) Iron is magnetic materials but steel is non-magnetic. 10. A ferrite core has less eddy-current loss than an iron a core because a) Ferrites have low resistance b) Ferrites have high resistance c) Ferrites have low permeability d) Ferrites have high hysteresis 11. Which of the following rules states that the direction of an induced current is always such that the magnetic field which it produces reacts in opposition to the change of flux. a) Thumb rule b) Lenz's law c) Kirchhoff's law d) Faraday's law 12. What conditions are necessary for an induced voltage to be created by means of rotation. a) A magnetic field b) Movably placed loops conductors (turns) c) Lump conductors d) (a) and (b) both 13. The operation of the electric generator and motor is based on the interaction between a) Magnetic field and electric field b) Magnetic field and electric current C) Electric field and law of induction d) Law of induction and dynamo-electric principle
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